Boiler globe valve Description
Boiler globe valve is a shutoff valve designed for boiler systems. It realizes the opening and closing control, flow regulation and pressure stability of the medium (water, steam, etc.) through the forced sealing of the valve disc.
Its core functions include:
Full open/full close shutoff: The forced sealing valve disc contacts the valve seat to achieve complete medium blocking;
Fine adjustment: The valve disc opening is adjusted by lifting the valve stem to control the medium flow and pressure;
Prevent backflow to ensure safety: The directional flow design avoids system failure caused by medium backflow.
Core structural features
Flow direction design optimization
Mostly adopt the "low in and high out" flow direction (positive structure), the medium flows in from the bottom of the valve disc, and the sealing is enhanced by the medium pressure when closed, reducing the operating torque.
Erosion-resistant sealing structure
Valve seat sealing surface: The conical sealing surface is welded with Stellite, which is resistant to high temperature (≤570℃) and granular medium erosion, and the service life is extended by more than 3 times;
Valve disc guide design: The ball cone bottom valve disc structure of the Y-type stop valve guides the flow of the medium and reduces the wear of the sealing surface by impurity deposition.
High-strength valve body
Alloy steel (such as ASTM A217 WC9) is used for high temperature and high pressure conditions (such as PN140/570℃), and carbon steel (such as WCB) is used for ordinary conditions.
Boiler globe valve specification
| Parts | Common materials | Typical Specifications |
|---|---|---|
| Valve body | WCB carbon steel, WC9 alloy steel | Nominal diameter：DN10-DN300 |
| Sealing surface | Stellite Alloy (CoCrW) Overlay | Nominal pressure：PN16-PN420 |
| Valve stem | 38CrMoAlA nitriding steel | Applicable temperature：-40℃~+570℃ |
| Connection method | Flange (RF/RTJ), butt welding (BW) | Drive mode: manual/electric |
Boiler globe valve
Advantages of boiler globe valves
Double seal design
The bellows + packing composite seal structure, even if the bellows fails, the packing can still prevent the medium from leaking, meeting the nuclear power grade sealing standards.
The sealing surface is welded with Stellite, which is resistant to high temperature (≤570℃) and particle erosion, and the service life is extended by more than 3 times.
Pressure and temperature resistance
The material is made of high-strength alloy steel (such as WC9) or nitrided valve stem (38CrMoAlA), with a pressure resistance of PN420 and a temperature of 570℃, and the high temperature creep resistance is increased by 2 times.
Low maintenance and long life
The structure is simple and modular (such as bolted valve cover), which supports quick disassembly and maintenance;
The flow resistance is small, the opening and closing time is short (only the valve stem needs to be lifted vertically), and the wear of the sealing surface due to frequent operation is reduced.
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